Model.Position=Vector3.new is not working, but clone does?

it clones the taco but it isnt set int he position i tried to set it in Error: Position is not a valid member of tool

script.Parent.ClickDetector.MouseClick:Connect(function()
    script.Parent.Size=Vector3.new(2, 0.20, 2)
    delay(0.5,function() script.Parent.Size=Vector3.new(2, 0.49, 2)
    end)

    local tacoh = game.Workspace.Taco:Clone()
    tacoh.Parent=game.Workspace
    tacoh.Position=Vector3.new(math.random(-100,100),100,math.random(-100,100))

end)